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you move them up or down on the chain link on the bottom or on the holes on the garage door frame where they attach at the top. proper adjustment has the door open about half way with free travel on the opener. you also can change the size/length of the spring to adjust tension one way or the other. generally the best adjustment is from the bottom. an obviously, it is easiest to move the springs when the door is fully open. block it fully open with a long 2x4 or something as you do this, otherwise the door will fall good luck

When the motor stops in the down position, pull the emergency release handle. Push the door fully closed by hand then engage the emergency handle. Open the door with the remote and then close it with the remote to make sure the door closes completely.

You will need to clear the memory of both openers by holding the smart/learn button in for 6 seconds. After doing this none of your remotes will work but your wall control will. Now you need to program the openers making sure you don't program any remotes for both doors.

It sounds like you have a broken or missing "upper limit switch". There is one for the down limit and should be one for the upper limit. If it is defective or missing the openers 'brain' will not tell the motor to reverse direction.

On the side of the motor unit you will find the 'down limit control'. Using a small screwdriver turn this control in the opposite direction of the arrow printed on the cover. Some tweaking will most likely be necessary. You can remove the cover and watch the limit switch assembly and get a good idea how it works.